Question 1

During which phase of the cell cycle does DNA replication occur, and what is the significance of this event for cell division?

Accepted Answer

DNA replication occurs during the S phase of interphase, ensuring each daughter cell receives an identical set of genetic material.

Question 2

Which checkpoint in the cell cycle ensures that the cell is ready to enter mitosis, and what is its primary function?

Accepted Answer

The G2/M checkpoint ensures the cell has completed DNA replication and repairs any DNA damage before entering mitosis.

Question 3

A cell is observed with chromosomes aligned at the center of the cell. Which phase is this, and what is the main event occurring?

Accepted Answer

Metaphase; chromosomes are aligned at the metaphase plate, preparing for separation.

Question 4

Which of the following best describes the outcome of mitosis in animal cells?

Accepted Answer

Two daughter cells, each genetically identical to the mother cell.

Question 5

If a cell fails to undergo cytokinesis after mitosis, what is the most likely result?

Accepted Answer

The cell will become multinucleate, containing more than one nucleus.

Question 6

Which cell types in the human body almost completely lose the ability to divide after puberty?

Accepted Answer

Skeletal muscle, cardiac muscle, and most mature neurons.

Question 7

During which phase of mitosis do sister chromatids separate and move toward opposite poles of the cell?

Accepted Answer

Anaphase

Question 8

What is the primary purpose of cell division in adult tissues subjected to abrasion, such as the skin and gut lining?

Accepted Answer

To repair and replace damaged or lost cells.

Question 9

Which phase of mitosis is characterized by the reformation of the nuclear envelope and the beginning of cytokinesis?

Accepted Answer

Telophase

Question 10

A researcher observes a cell with a contractile ring forming at the center. Which process is occurring, and what is its function?

Accepted Answer

Cytokinesis; dividing the cytoplasm to form two daughter cells.

Question 11

Which equation best represents the genetic outcome of mitosis in somatic cells?

Accepted Answer

$$2n \rightarrow 2n + 2n$$

Question 12

Which event distinguishes meiosis from mitosis in terms of genetic diversity?

Accepted Answer

Meiosis produces four daughter nuclei that differ genetically from the mother nucleus.

Question 13

A patient has a liver injury. Which statement best describes the liver cells' response?

Accepted Answer

Liver cells stop dividing but retain the ability to divide if some are removed or damaged.

Question 14

Which of the following is NOT a phase of mitosis?

Accepted Answer

Interphase

Question 15

What is the main function of the spindle fibers during mitosis?

Accepted Answer

To align and separate chromosomes during cell division.

Question 16

Which phase of the cell cycle is the longest and involves growth and normal metabolic activities?

Accepted Answer

Interphase

Question 17

A cell is observed with fragmented nuclear envelope and spindle fibers attaching to kinetochores. Which phase is this?

Accepted Answer

Late prophase

Question 18

Which equation best represents the DNA content change during the S phase of interphase?

Accepted Answer

$$C \rightarrow 2C$$

Question 19

Which of the following statements about centriole replication is correct?

Accepted Answer

Centriole replication occurs during interphase of the next cell cycle.

The Cell Cycle and Mitosis: Structure, Phases, and Significance

Study Guide - Practice Questions